CELL DIVISION
MEIOSIS AND GENETIC VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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synapsis, tetrad, crossing over
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crossing over, splitting chromatids, homologous chromosomes lining up
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crossing over, independ. assortment, random sperm fertilizes egg
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Detailed explanation-1: -At the level of crossing over during prophase-I which creates newer genetic combinations. At the level of separation of homologous chromosomes during metaphase-I (independent assortment) At the level of fertilization when there is random fusion of any sperm with any egg.
Detailed explanation-2: -Specifically, meiosis creates new combinations of genetic material in each of the four daughter cells. These new combinations result from the exchange of DNA between paired chromosomes. Such exchange means that the gametes produced through meiosis exhibit an amazing range of genetic variation.
Detailed explanation-3: -During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.
Detailed explanation-4: -Why is Meiosis Important in Studying Biology? Meiosis is important for three main reasons: it allows sexual reproduction of diploid organisms, it enables genetic diversity, and it aids the repair of genetic defects.